Manchester attack: new arrest as police search for accomplices – live

What we know so far

The investigation

Police arrested a man in Manchester’s Moss Side in the early hours of Friday in connection with the attack on Manchester Arena.

Eight men are now in custody. One of them is believed to be Ismail Abedi, 23, the brother of the bomber, Salman Abedi.

A man and a woman arrested earlier in the investigation have been released without charge.

Police raids in the south of the city on Thursday uncovered suspicious materials similar to those used in the bombing that killed 22 people. Bomb disposal experts were brought in to search a house in Wigan on Thursday evening.

Officers have warned that accomplices may still be at large and bomb-making equipment could be as yet undiscovered.

UK officials have begun sharing intelligence with US counterparts again, after reassurances were made following a series of leaks to American media.

The threat level remains at “critical”, with troops continuing to guard key locations and armed police for the first time patrolling trains outside the capital.

The perpetrator

Abedi is believed to have returned to the UK from Libya only days before Monday’s attack. He travelled via Istanbul last Thursday, and Düsseldorf.

Republican congressman Mike McCaul, chair of the homeland security committee, said Abedi had used triacetone triperoxide (TATP), the explosive used in the 7/7 attacks on London, as well as the Paris and Brussels attacks.

The victims

All 22 people killed in the attack have now been named. You can read about them here.

Of the 116 people taken to eight hospitals in the wake of the attack, 75 are still being treated, of whom 23 remain in critical care, some with “life-changing injuries”. This includes five children at the Royal Manchester children’s hospital, visited by the Queen on Thursday.

NHS England has sent an alert to England’s 27 major trauma centres to prepare for a possible further incident over the bank holiday weekend.

Election campaign resumes

The home secretary, Amber Rudd, has denied that government cuts to police numbers contributed to the attack.

Rudd will chair this morning’s meeting of the government’s emergency Cobra committee, as Theresa May attends the G7 summit in Sicily.

Labour leader Jeremy Corbyn will today make a speech drawing a link between Britain’s foreign policy and terror attack. But he will add:

That assessment in no way reduces the guilt of those who attack our children. Those terrorists will forever be reviled and held to account for their actions. But an informed understanding of the causes of terrorism is an essential part of an effective response that will protect the security of our people that fights rather than fuels terrorism.

Theresa May will urge G7 leaders today to tell technology firms that they should do more to suppress extremist content online, arguing that the fight against Islamic State is shifting from the “battlefield to the internet”.

The prime minister will tell fellow leaders at the summit in Sicily that every country should encourage companies such as Facebook, Google and Twitter to block users who post extremist content and report individuals to authorities if there is evidence of imminent harm.

Addressing a small group of powerful counterparts, including Donald Trump and new French president Emmanuel Macron, May will argue that more has to be done to tackle the threat posed by extremist content online in the aftermath of the Manchester Arena attack.

The prime minister believes that cooperation between major industrial countries could help force the social media companies to:

develop tools that could automatically identify and remove harmful material based on what it contains and who posted it

tell the authorities when harmful material is identified so that action can be taken, and

revise conditions and industry guidelines to make them absolutely clear about what constitutes harmful material.

Theresa May calls on tech firms to lead fight against online extremism

On Friday, as world leaders including Donald Trump and Theresa May attend the G7 summit in Sicily, Rex Tillerson will visit London – his first official trip as US secretary of state – to meet foreign secretary Boris Johnson.

According to the US state department, Tillerson will:

extend condolences for the May 22 terrorist attack in Manchester on behalf of the American people to the British people and Her Majesty’s government [and] reaffirm America’s commitment to the special relationship between the United States and the United Kingdom and our solidarity in defeating terrorism in every part of the world.

Later, Tillerson and Johnson will sign the book of condolence for victims of the Manchester attack.

Australian prime minister Malcolm Turnbull says the country will continue to share its intelligence with the United States in the wake of its rift with the UK over a series of leaks over the Manchester bombing.

“Clearly this was a regrettable breach of security and you can see how disappointed president Trump was about it so regrettably these things do happen, but it was as regretted by President Trump as it was by prime minister May,” Turnbull said.

Asked if he trusted the United States, he said: “Yes, we do.”

In the wake of the Manchester bombing, Turnbull said there was currently a review of intelligence services, which would include the issue of a dedicated minister for homeland security.

He said Australian security agencies had been very successful at thwarting terrorist plots but it was not possible to guarantee they could thwart every one.